Methyl esterification crude ester continuous sedimentation automatic purification device in biodiesel production

Abstract

The utility model discloses a continuous settling and automatic purifying device for methyl esterification crude ester in biodiesel production. A settling tank is provided with four stages, and manholes, blow-down pipes and feeding pipes are arranged at the tops of an acid glycerol receiving tank and each settling tank; a feeding pipe of the lower-stage sedimentation tank is connected with a discharging opening in the upper part of the upper-stage tank, a partition plate is arranged in each sedimentation tank, a tank cone material emptying pipe with a valve is arranged on one side of the bottom of each sedimentation tank, a tuning fork densimeter is arranged at the bottom of each sedimentation tank, and a continuous discharging pipe with a valve of the fourth-stage sedimentation tank is converged with a discharging pipe of each stage of sedimentation tank, passes through a crude ester conveying pump and then is connected to a continuous ester exchange process; an acid glycerol discharge pipe with an interlocking pneumatic valve is arranged at the cone bottom of each settling tank and is connected to an acid glycerol receiving tank after being converged, and the discharge pipe of the tank is connected to an acid glycerol storage tank after being connected with an acid glycerol delivery pump; the fourth-stage settling tank and the acid glycerol receiving tank are provided with liquid level meters with magnetic turning plates; and the precipitation tanks are arranged in a step-by-step descending manner so as to ensure that materials in the previous-stage tank automatically flow to the next stage. The crude ester and impurity separation device is good in crude ester and impurity separation effect, simple and efficient to operate and safe and reliable to run.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary devices for biodiesel production, and particularly relates to a continuous sedimentation and automatic purification device for methyl esterified crude ester in biodiesel production. Background Art

[0002] The industrial production method of biodiesel generally adopts the two-step acid-base method. The current relatively mature two-step acid-base method basically adopts the kettle-type batch production method. The disadvantages of this batch production method are as follows: First, the quality of the batch production process is unstable, the process index deviation is large, and the material consumption and energy consumption of subsequent processes are large; Second, the batch production operation is frequent, the labor intensity is large, the probability of operation errors is large, and it is easy to cause unqualified rework; Third, the degree of automation of batch production is low, the labor employment is large, the labor cost is high, and the product production cost is high. Therefore, it has become an inevitable trend to replace batch production with continuous transesterification production of biodiesel. For this reason, it is necessary to design a continuous sedimentation and automatic purification device for methyl esterified crude ester in biodiesel production to create a prerequisite for the subsequent implementation of continuous transesterification of biodiesel. Summary of the Invention

[0003] The purpose of the utility model is to provide a continuous sedimentation and automatic purification device for methyl esterified crude ester in biodiesel production, which has good separation effect between biodiesel crude ester and impurities, is simple and efficient in operation, and is safe and reliable in operation, according to the characteristic that there is a large density difference between impurities and crude ester in methyl esterified crude ester of biodiesel.

[0004] To achieve the above object, the automatic purification device for continuous sedimentation of methyl ester crude ester in biodiesel production of the present utility model comprises a sedimentation tank, an acid glycerol receiving tank 5, an acid glycerol transfer pump p-1 and a crude ester transfer pump p-2; the sedimentation tank has four levels, and each tank top arc-shaped cover of the sedimentation tank is provided with a normally closed manhole of the tank body, a vent pipe with a vent control ball valve of the tank body and a feed pipe with a feed control ball valve into the tank. The feed pipe of the next-level sedimentation tank is connected to the upper-side discharge port of the previous-level sedimentation tank. A full-welded partition is arranged inside each sedimentation tank. A discharge pipe with a cone-bottom material discharge control ball valve is arranged on one side of the bottom of each sedimentation tank. A tuning fork densitometer is arranged at the bottom of each sedimentation tank. A continuous discharge pipe with a continuous transesterification feed cylinder control valve 4-8 is arranged on one side of the lower part of the fourth-level sedimentation tank. After the continuous discharge pipe converges with the discharge pipes of each sedimentation tank, it is connected to the inlet of the crude ester transfer pump p-2, and the pump outlet is connected to the continuous transesterification process; an acid glycerol discharge pipe with a cone-bottom interlocking pneumatic discharge ball valve is arranged at the bottom of each sedimentation tank. After the acid glycerol discharge pipes of each level converge, they are connected to the feed pipe with a feed control ball valve 5-1 arranged at the top of the acid glycerol receiving tank 5. The top of the acid glycerol receiving tank 5 is also provided with a normally closed manhole 5-2 of the tank body and a vent control ball valve 5-3 of the tank body. An outlet pipe with an acid glycerol discharge valve 5-4 is arranged on one side of the lower part of the acid glycerol receiving tank 5. After the outlet pipe is connected to the acid glycerol transfer pump p-1, it is connected to the acid glycerol storage tank; both the fourth-level sedimentation tank and the acid glycerol receiving tank 5 are provided with magnetic flap level gauges; the arrangement heights of the sedimentation tanks decrease gradually to ensure that the materials in the previous-level tank flow by gravity to the next level.

[0005] The automatic purification device for continuous sedimentation of methyl ester crude ester in biodiesel production of the present utility model has the following technical features and beneficial effects:

[0006] 1. The process is continuous, greatly improving the working efficiency and avoiding the instability of process quality;

[0007] 2. The process is automated, avoiding human operation errors, enabling unattended operation, saving labor costs and enhancing the market competitiveness of the enterprise;

[0008] 3. The device is airtight, avoiding direct contact and ensuring safety. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the automatic purification device for continuous sedimentation of methyl ester crude ester in biodiesel production of the present utility model.

[0010] Reference numerals: primary sedimentation tank 1, primary inlet tank control ball valve 1-1, primary tank normally closed manhole 1-2, primary tank vent control ball valve 1-3, primary tank built-in full-welded partition 1-4, primary tank cone material discharge control ball valve 1-5, primary cone bottom interlocked pneumatic discharge ball valve 1-6, primary tuning fork densitometer 1-7, secondary sedimentation tank 2, secondary inlet tank control ball valve 2-1, secondary tank normally closed manhole 2-2, secondary tank vent control ball valve 2-3, secondary tank built-in full-welded partition 2-4, secondary tank cone material discharge control ball valve 2-5, secondary cone bottom interlocked pneumatic discharge ball valve 2-6, secondary tuning fork densitometer 2-7, tertiary sedimentation tank 3, tertiary inlet tank control ball valve 3-1, tertiary tank normally closed manhole 3-2, tertiary tank vent control ball valve 3-3, tertiary tank built-in full-welded partition 3-4, tertiary tank cone material discharge control ball valve 3-5, tertiary cone bottom interlocked pneumatic discharge ball valve 3-6, tertiary tuning fork densitometer 3-7, quaternary sedimentation tank 4, quaternary inlet tank control ball valve 4-1, quaternary tank normally closed manhole 4-2, quaternary tank vent control ball valve 4-3, quaternary tank built-in full-welded partition 4-4, quaternary tank cone material discharge control ball valve 4-5, quaternary cone bottom interlocked pneumatic discharge ball valve 4-6, quaternary tuning fork densitometer 4-7, continuous transesterification feed cylinder control valve 4-8, acid glycerol receiving tank 5, inlet tank control ball valve 5-1, tank normally closed manhole 5-2, tank vent control ball valve 5-3, acid glycerol discharge valve 5-4, acid glycerol transfer pump p-1, crude ester transfer pump p-2. Detailed implementation manners

[0011] The following further elaborates on the automatic purification device for continuous sedimentation of methyl esterified crude ester in the production of biodiesel of the present utility model in conjunction with the accompanying drawings and detailed implementation manners.

[0012] As Figure 1As shown in the figure, the automatic purification device for continuous sedimentation of methyl ester crude ester in the production of biodiesel of the present utility model includes a sedimentation tank, an acid glycerol receiving tank 5, an acid glycerol transfer pump p-1, and a crude ester transfer pump p-2; the sedimentation tank has four levels, and each sedimentation tank's tank top arc-shaped cover is provided with a normally closed manhole of the tank body, a vent pipe with a vent control ball valve of the tank body, and a feed pipe with a feed control ball valve into the tank. The feed pipe of the next-level sedimentation tank is connected to the upper-side discharge port of the previous-level sedimentation tank. Inside each sedimentation tank, there is a full-welded partition inside the tank body. On one side of the bottom of each sedimentation tank, there is a discharge pipe with a cone-bottom material discharge control ball valve. On the bottom of each sedimentation tank, there is a tuning fork densitometer. On one side of the lower part of the fourth-level sedimentation tank, there is a continuous discharge pipe with a continuous transesterification feed cylinder control valve 4-8. After this continuous discharge pipe converges with the discharge pipes of each sedimentation tank, it is connected to the inlet of the crude ester transfer pump p-2, and the pump outlet is connected to the continuous transesterification process; on the bottom of each sedimentation tank, there is an acid glycerol discharge pipe with a cone-bottom interlocking pneumatic discharge ball valve. After the acid glycerol discharge pipes of each level converge, they are connected to the feed pipe with a feed control ball valve 5-1 provided on the top of the acid glycerol receiving tank 5. On the top of the acid glycerol receiving tank 5, there is also a normally closed manhole 5-2 of the tank body and a vent control ball valve 5-3 of the tank body. On one side of the lower part of the acid glycerol receiving tank 5, there is a discharge pipe with an acid glycerol discharge valve 5-4. After this discharge pipe is connected to the acid glycerol transfer pump p-1, it is connected to the acid glycerol storage tank; both the fourth-level sedimentation tank and the acid glycerol receiving tank 5 are provided with magnetic flap level gauges; the layout heights of each sedimentation tank decrease gradually to ensure that the materials in the previous-level tank flow by gravity to the next level.

[0013] When the production process is started, the feed control ball valves, vent control ball valves of the tank body, and continuous transesterification feed cylinder control valves 4-8 of each sedimentation tank and the acid glycerol receiving tank 5 are all in the normally open state; the cone-bottom material discharge control ball valves of each sedimentation tank are in the normally closed state; the opening / closing state of the cone-bottom interlocking pneumatic discharge ball valves of each sedimentation tank is controlled by the tuning fork densitometers in each sedimentation tank to on-line and real-time monitor whether the density of the material reaches the upper and lower limits of the process setting value; the start / stop of the acid glycerol transfer pump p-1 is controlled by the 4-20 mA signal setting the upper and lower limits of the magnetic flap level gauge of the acid glycerol receiving tank 5; the start / stop of the crude ester transfer pump p-2 is controlled by the 4-20 mA signal setting the upper and lower limits of the magnetic flap level gauge of the four-level sedimentation tank 4; the cone-bottom material discharge control ball valves of each sedimentation tank are used for discharging the emptying materials of the process.

[0014] After the biodiesel is methyl-esterified, the crude fatty acid methyl ester enters the first-stage settling tank 1 through the first-stage inlet control ball valve 1-1. When the material level reaches the lower edge of the built-in full-welded partition 1-4 in the first-stage tank, the subsequent incoming material forms a "U" flow in the first-stage settling tank 1. When the material reaches the discharge port, it flows into the second-stage settling tank 2, and this process is repeated until the material enters the fourth-stage settling tank 4. When the material level in the fourth-stage settling tank 4 reaches the upper limit of the set level of the magnetic turning plate level gauge, the 4-20 mA signal of the magnetic turning plate controls the start of the crude ester transfer pump p-2, and the material is continuously transported to the continuous transesterification process. When the material level in the fourth-stage settling tank 4 drops to the lower limit of the set level of the magnetic turning plate level gauge, the 4-20 mA signal of the magnetic turning plate controls the stop of the crude ester transfer pump p-2, and the continuous transesterification process is interrupted. Since the impurities in the methyl-esterified crude ester are denser than the crude ester, they will continuously settle and accumulate in the bottom cone triangular area of each stage of the settling tank throughout the process. When the fork density meter in each cone part monitors that the density reaches the set upper limit, the corresponding pneumatic valve opens to continuously discharge the slag to the acid glycerol receiving tank 5. When the fork density meter monitors that the density reaches the set lower limit, the corresponding pneumatic valve closes to stop discharging the slag. When the material level in the acid glycerol receiving tank 5 reaches the upper limit of the set level of the magnetic turning plate level gauge, the 4-20 mA signal of the magnetic turning plate controls the start of the crude ester transfer pump p-1, and the acid glycerol is continuously transported to the acid glycerol storage tank. When the material level in the acid glycerol receiving tank 5 drops to the lower limit of the set level of the magnetic turning plate level gauge, the 4-20 mA signal of the magnetic turning plate controls the stop of the crude ester transfer pump p-1 from feeding.

Claims

1. A continuous sedimentation and automatic purification device for methyl ester crude ester in biodiesel production, characterized in that: It includes a precipitation tank, an acid glycerol receiving tank (5), an acid glycerol transfer pump (p-1), and a crude ester transfer pump (p-2); the precipitation tank has four levels, and each tank top arc-shaped cover of the precipitation tanks is provided with a normally closed manhole of the tank body, a vent pipe with a vent control ball valve of the tank body, and a feed pipe with a feed control ball valve into the tank. The feed pipe of the next-level precipitation tank is connected to the upper-side discharge port of the previous-level precipitation tank. Inside each precipitation tank, there is a full-welded partition inside the tank body. On one side of the bottom of each precipitation tank, there is a discharge pipe with a cone-bottom material discharge control ball valve. At the bottom of each precipitation tank, there is a tuning fork densitometer. On one side of the lower part of the fourth-level precipitation tank, there is a continuous discharge pipe with a continuous transesterification feed cylinder control valve (4-8). After this continuous discharge pipe converges with the discharge pipes of each precipitation tank, it is connected to the inlet of the crude ester transfer pump (p-2), and the pump outlet is connected to the continuous transesterification process; at the bottom of each precipitation tank, there is an acid glycerol discharge pipe with a cone-bottom interlocking pneumatic discharge ball valve. After the acid glycerol discharge pipes of each level converge, they are connected to the feed pipe with a feed control ball valve (5-1) provided at the top of the acid glycerol receiving tank (5). On the top of the acid glycerol receiving tank (5), there is also a normally closed manhole of the tank body (5-2) and a vent control ball valve of the tank body (5-3). On one side of the lower part of the acid glycerol receiving tank (5), there is a discharge pipe with an acid glycerol discharge valve (5-4). After this discharge pipe is connected to the acid glycerol transfer pump (p-1), it is connected to the acid glycerol storage tank; both the fourth-level precipitation tank and the acid glycerol receiving tank (5) are provided with magnetic flap level gauges; the arrangement heights of the precipitation tanks decrease gradually to ensure that the materials in the previous-level tank flow by gravity to the next level.

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